The invention relates to a dual sensor module, a dual sensor accessory, a dual sensor device and related applications. The optical sensor module comprises a substrate; a light source disposed on the substrate; a first package body formed on the light source; a photodetector disposed on the substrate; a second package body disposed on the photodetector; and a first electrode electrically connected to the substrate. The dual sensor accessory includes the dual sensor module, a communication module and a housing. The dual sensor device includes the dual sensor module, a microprocessor, a memory, a power supply, and a housing. The dual sensor device can be used to acquire optical information and electrical information in a limited area.